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JEE Mains · Maths · STD 12 - 1. relation and function

माना द्विघात बहुपद \(f ( x )\) इस प्रकार है कि \(f (-2)+ f (3)=0\) है। यदि \(f ( x )=0\) का एक मूल \(-1\) है, तो \(f ( x )=0\) के मूलों का योगफल है :

  1. A \(\frac{11}{3}\)
  2. B \(\frac{7}{3}\)
  3. C \(\frac{13}{3}\)
  4. D \(\frac{14}{3}\)
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Answer & Solution

Correct Answer

(A) \(\frac{11}{3}\)

Step-by-step Solution

Detailed explanation

\(f (-2)+ f (3)=0\) \(f ( x )=( x +1)( ax + b )\) \(f (-2)+ f (3)=-1(-2 a + b )+4(3 a + b )=0\) \(2 a - b +12 a +4 b =0\) \(14 a +3 b =0\) \(\frac{- b }{ a }=\frac{14}{3}\) Sum of roots \(=\left(-1+\frac{-b}{a}\right)=-1+\frac{14}{3}=\frac{11}{3}\)
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